I have an Olympus VN-960PC digital voice recorder (DVR). It saves its recordings in compressed .wav format files. When I listen to those recordings, I usually use IrfanView to listen to them. I have been using IrfanView for years, and have found it to be markedly more useful and flexible than any other program for many image editing, audio listening, file viewing, and other multimedia tasks. It is really amazing freeware.
Error: Windows can't play this file! Windows error text: Invalid MCI device ID. Use the ID returned when opening the MCI device.. You can try to install additional video/audio codecs from this site: http://www.fourcc.org/indexcod.htm or try the DirectShow option in Properties->Video.